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+//===- CodeMetrics.h - Code cost measurements -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements various weight measurements for code, helping
+// the Inliner and other passes decide whether to duplicate its contents.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_CODEMETRICS_H
+#define LLVM_ANALYSIS_CODEMETRICS_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallPtrSet.h"
+
+namespace llvm {
+class AssumptionCache;
+class BasicBlock;
+class Loop;
+class Function;
+class Instruction;
+class DataLayout;
+class TargetTransformInfo;
+class Value;
+
+/// Utility to calculate the size and a few similar metrics for a set
+/// of basic blocks.
+struct CodeMetrics {
+  /// True if this function contains a call to setjmp or other functions
+  /// with attribute "returns twice" without having the attribute itself.
+  bool exposesReturnsTwice = false;
+
+  /// True if this function calls itself.
+  bool isRecursive = false;
+
+  /// True if this function cannot be duplicated.
+  ///
+  /// True if this function contains one or more indirect branches, or it contains
+  /// one or more 'noduplicate' instructions.
+  bool notDuplicatable = false;
+
+  /// True if this function contains a call to a convergent function.
+  bool convergent = false;
+
+  /// True if this function calls alloca (in the C sense).
+  bool usesDynamicAlloca = false;
+
+  /// Number of instructions in the analyzed blocks.
+  unsigned NumInsts = false;
+
+  /// Number of analyzed blocks.
+  unsigned NumBlocks = false;
+
+  /// Keeps track of basic block code size estimates.
+  DenseMap<const BasicBlock *, unsigned> NumBBInsts;
+
+  /// Keep track of the number of calls to 'big' functions.
+  unsigned NumCalls = false;
+
+  /// The number of calls to internal functions with a single caller.
+  ///
+  /// These are likely targets for future inlining, likely exposed by
+  /// interleaved devirtualization.
+  unsigned NumInlineCandidates = 0;
+
+  /// How many instructions produce vector values.
+  ///
+  /// The inliner is more aggressive with inlining vector kernels.
+  unsigned NumVectorInsts = 0;
+
+  /// How many 'ret' instructions the blocks contain.
+  unsigned NumRets = 0;
+
+  /// Add information about a block to the current state.
+  void analyzeBasicBlock(const BasicBlock *BB, const TargetTransformInfo &TTI,
+                         const SmallPtrSetImpl<const Value*> &EphValues);
+
+  /// Collect a loop's ephemeral values (those used only by an assume
+  /// or similar intrinsics in the loop).
+  static void collectEphemeralValues(const Loop *L, AssumptionCache *AC,
+                                     SmallPtrSetImpl<const Value *> &EphValues);
+
+  /// Collect a functions's ephemeral values (those used only by an
+  /// assume or similar intrinsics in the function).
+  static void collectEphemeralValues(const Function *L, AssumptionCache *AC,
+                                     SmallPtrSetImpl<const Value *> &EphValues);
+};
+
+}
+
+#endif